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某同学期中考试全班第一,则期末考试 (填“不可能”,“可能”或“必然”)全班第一...
某同学期中考试全班第一,则期末考试 (填“不可能”,“可能”或“必然”)全班第一.
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冰柜里装有四种饮料:5瓶特种可乐、12瓶普通可乐、9瓶橘子水、6瓶啤酒,其中特种可乐和普通可乐是含有咖啡因的饮料,那么从冰柜里随机取一瓶饮料,该饮料含有咖啡因的概率是( )
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A.
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B.
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C.
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D.
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袋中有16个球,7个白球,3个红球,6个黄球,从中任取一个,得到红球的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001215972714897/SYS201311030012159727148002_ST/0.png)
B.
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C.
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D.
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一名保险推销员对人们说:“人有可能得病,也有可能不得病,因此,得病与不得病的概率各占50%”,他的说法( )
A.正确
B.有时正确,有时不正确
C.不正确
D.应根据气候等条件确定
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在一个不透明的袋中,装有若干个除颜色不同外其余都相同的球,如果袋中有3个红球且摸到红球的概率为
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,那么袋中球的总个数为( )
A.15个
B.12个
C.9个
D.3个
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细心观察下图,认真分析各式,然后解答问题.
(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001208522276703/SYS201311030012085222767023_ST/0.png)
)
2+1=2 S
1=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001208522276703/SYS201311030012085222767023_ST/1.png)
(
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)
2+1=3 S
2=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001208522276703/SYS201311030012085222767023_ST/3.png)
(
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)
2+1=4 S
3=
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(1)请用含n(n是正整数)的等式表示上述变化规律;
(2)推算出OA
10的长;
(3)求出S
12+S
22+S
22+…+S
102的值.
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